| 1 | Halide Homogenization for High-Performance Blue Perovskite Electroluminescence显示文摘Metal halide perovskite light-emitting diodes(LEDs)have achieved great progress in recent years.However,bright and spectrally stable blue perovskite LED remains a significant challenge.Three-dimensional mixed-halide perovskites have potential to achieve high brightness electroluminescence,but their emission spectra are unstable as a result of halide phase separation.Here,we reveal that there is already heterogeneous distribution of halides in the as-deposited perovskite films,which can trace back to the nonuniform mixture of halides in the precursors.By simply introducing cationic surfactants to improve the homogeneity of the halides in the precursor solution,we can overcome the phase segregation issue and obtain spectrally stable single-phase blueemitting perovskites.We demonstrate efficient blue perovskite LEDs with high brightness,e.g.,luminous efficacy of 4.7,2.9,and 0.4 lmW^(-1) and luminance of over 37,000,9,300,and 1,300 cdm^(-2) for sky blue,blue,and deep blue with Commission Internationale de l’Eclairage(CIE)coordinates of(0.068,0.268),(0.091,0.165),and(0.129,0.061),respectively,suggesting real promise of perovskites for LED applications. | Lu Cheng Chang Yi Yunfang Tong Lin Zhu Gunnar Kusch Xiaoyu Wang Xinjiang Wang Tao Jiang Hao Zhang Ju Zhang Chen Xue Hong Chen Wenjie Xu Dawei Liu Rachel AOliver Richard HFriend Lijun Zhang Nana Wang Wei Huang Jianpu Wang | 2020 | Research2020，，1： | 4 |
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